During the last week the observing schedule was replanned to
incorporate an observation of GRB150423A, which was accepted as a
Director's Discretionary Time Target of Opportunity on Apr 28.
Scheduled observations of NGC4487 and MCG+01-32-049 were impacted by
the replan and will be rescheduled in future weeks.

A Chandra press release was issued on Apr 30 describing results from a
study that suggests a group of unusual giant black holes may be
consuming excessive amounts of matter. Thick, donut-shaped disks may
be surrounding the black holes, blocking much of the light that would
otherwise be emitted. The black holes in these quasars may be growing
at an extraordinarily rapid rate. For details see:
http://chandra.si.edu/press/15_releases/press_043015.html

Also of note this week was the announcement on Apr 30 of the release
of version 5.1 of MARX, a suite of programs designed to enable the user
to simulate the on-orbit performance of the Chandra X-ray
Observatory. For details see: http://space.mit.edu/ASC/marx/index.html
Also announced was the availability, as of Apr 21, of Sherpa as an Open
Source project with its source code repository available on GitHub
(https://github.com/sherpa/sherpa). Sherpa is the CIAO modeling and
fitting application. It enables the user to construct complex models
from simple definitions and fit those models to data, using a variety
of statistics and optimization methods.

The schedule of targets for the next two weeks is shown below and
includes an observation of GRB 150314A, which is a Target of
Opportunity follow-up accepted on Mar 19, observations of
CXOU J171405.7-381031 and Centaurus A coordinated with NuSTAR, and
observations of Praesepe coordinated with Kepler.